Sealing of fluid systems



Sept. 15, 1953 M, F; PETERS 2,652,223

SEALING OF FLUID SYSTEMS Filed Jan. 2 1951 INVENTOR. Q/e/ {1112- fifismes A 7- roR/ws Patented Sept. 15, 1953 UNITED STATES PATENT OFFICE 6 Claims.

This invention relates to fluid systems, and parcularly to the sealing of such pressure or velocity.

In many fluid systems is by use of valves having likelihood of such a failure.

Another object of the invention is to provide a hermetically sealed reservoir shown at I, the main valve head at I0, controlling the main fluid flow path II I2, the main valve housing at 6, and the reservoir at the latter containing a second bellows assembly I5 having an end plate I1 that may move to the left in response to the withdrawal of pressure fluid by way of the control passage through the center of housing extension I 3'. This control passage may lead to a remotely disposed manually operable pulsator type of piston-cylinder combination for transmitting fluid pressure to the interior of bellows unit I 5. Alternatively, the shifting of plate I7 may be by means of a manually operable rod attached thereto and extending out through element I3.

annular space between bellows I5 and the housing 5.

The relationship of auxiliary housing 5 to the main housing 6 may be as illustrated, or the housing 5 may be a separate unit and the passage l3 in the form of a connectin conduit from one unit to the other. Again, the point of entry of passage I3, with respect to chamber 5, may be as illustrated, or it may be at some other level, depending on whether complete ravity drainage of chamber 5 is desired.

In the illustrated position of the main valvethis being the position for flow between conduits II and I2the secondary valve collar 9 engages seat 1 in wall 8 of the main housing, thus sealing bellows I from the conduit I2. Pressure exerted by the fluid trapped in bellows I is relieved by being diverted to auxiliary reservoir 5, by way of passage I3. Subsequently, on closure of valve I0, and concurrent opening of secondary valve 1, the plate I! of auxiliary bellows I5 operates to exert pressure on the fluid in reservoir 5 and return such fluid to the system, by way of the same passage I 3.

In case of failure of primary bellows l, large vent I4 provides an immediate pressure relief, so that there is no possibility of emergence of fluid through packing gland 2 and the valve stem at a dangerously high pressure or velocity.

What I claim is:

1. In a fluid system, a main flow control valve stem having upper and lower valve heads, a primary sealing means located above said upper valve through said lower valve head, said upper valve head closing oii flow into said primary sealing means when said lower valve head is in flow-permitting position, and a secondary sealing means communicating with the interior of said primary sealing means to relieve excessive pressure within said primary sealing means.

2. In a fluid system, a main flow control valve, a primary sealing bellows efiective throughout the period of flow through said valve, and a secondary sealing means communicating with the interior of said bellows to serve as a reservoir for fluid trapped in said bellows.

3. A system as defined in claim 2, wherein said secondary sealing means includes a reservoir, and secondary bellows means associated with said reservoir to control operation thereof.

4. A system as defined in claim 2, including a housing surrounding said primary bellows, said housing also surrounding the stem of said flow MELVILLE F. PETERS.

References Cited in the file of this patent UNITED STATES PATENTS 

